Electrical Configuration - Siemens SIMATIC S7-400 Hardware And Installation Manual

8.3

Electrical Configuration

Introduction
This section contains the important information you need for the electrical
configuration of an M7-400. You will learn:
How to calculate the current consumption of an M7-400, based on a
configuration example, and how to select the required power supply module.
The additional facilities for expansion with PROFIBUS DP.
All other important information for the electrical configuration applies both to the
S7-400 and to the M7-400 modules and is described in Chapter 4.
Choosing the Power Supply Module
This section uses an example to show how you can estimate the current
consumption of a rack. You should make this estimate for each rack of your
M7-400 system, in order to select the appropriate power supply module for the
rack.
Current consumption and power dissipation of the individual modules can be found
in the relevant data sheets.
Calculation Example
The following modules are to be fitted in a CR with 18 slots:
1 CPU 488-3
1 interface submodule IF 962-VGA
1 interface submodule IF 962-COM
1 expansion module EXM 478
2 interface submodules IF 961-DIO
1 interface submodule IF 961-AIO
1 mass storage module MSM 478
1 AT adapter module ATM 478
1 short AT module (LAN)
3 analog input modules SM 431, AI 16 x 16 bits
3 digital input modules SM 421, DI 32 x 34 VDC
3 digital output modules SM 422, DO 32 x 34 VDC
1 send IM
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
www.gkbpx.com
Assembling the M7-400
8-5